Sequence Similarity : Non-homologous sequences (<30%) SEQUENCE SIMILARITY (%) 2fa5A 2fa5B 2fbhA 2ntxA 2fa5A 100 99 53 55 2fa5B 99 100 53 70 2fbhA 53 53 100 79 2ntxA 0 0 79 100 FOLD SIMILARITY (Z-SCORE) 2fa5A 2fa5B 2fbhA 2ntxA 2fa5A 24.2 21.8 14.8 1.6 2fa5B 21.8 24.2 15 0.5 2fbhA 14.8 15 24.9 0.9 2ntxA 0 0 1 45